An information theory model for dissipation in open quantum systems

8th International Workshop DICE2016: Spacetime - Matter - Quantum Mechanics

物理学;力学

Rogers, David M.^1

Department of Chemistry, University of South Florida, Tampa

FL

33620, United States^1

关键词: Decoherence time scale;    Environmental noise;    Generating functions;    High temperature;    Langevin equation;    Moment generating function;    Open quantum systems;    Subjective uncertainty;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/880/1/012039/pdf
DOI  :  10.1088/1742-6596/880/1/012039

学科分类：力学，机械学

来源: IOP

【 摘 要 】

This work presents a general model for open quantum systems using an information game along the lines of Jaynes' original work. It is shown how an energy based reweighting of propagators provides a novel moment generating function at each time point in the process. Derivatives of the generating function give moments of the time derivatives of observables. Aside from the mathematically helpful properties, the ansatz reproduces key physics of stochastic quantum processes. At high temperature, the average density matrix follows the Caldeira-Leggett equation. Its associated Langevin equation clearly demonstrates the emergence of dissipation and decoherence time scales, as well as an additional diffusion due to quantum confinement. A consistent interpretation of these results is that decoherence and wavefunction collapse during measurement are directly related to the degree of environmental noise, and thus occur because of subjective uncertainty of an observer.